I knew they were doing hearing aids

So, Colombo was cleaning his glass eye by licking it when he accidentally swallowed it. He rushed off to the hospital and the doctor pushed a mini camera down his throat. "I can't see anything" he said. "Drop your pants and I'll see if I can see anything from the other end". So he did as he was told. "I can't see anything from this end either" said the doctor. "Strange" said Colombo," I can see you!